Abstract: A fluid friction clutch especially for powering a rotary cooling fan for an internal combustion engine. The clutch has a driven part with a drive disc rotating in a drive chamber which is separated from a fluid reservoir chamber by a separating wall within the clutch housing. A passage in the separating wall can be opened and closed by a valve assembly which is actuated by a temperature-dependent element. The temperature-dependent element is an expansion element containing a substance which undergoes volume changes as a function of temperature. The expansion element is heated electrically by means of a PTC resistor under the control of a thermal switch which reacts to engine-related temperatures. When the power supply to the PTC heater is interrupted, the clutch engages and provides full cooling power.

Abstract: Disclosed is an elastomeric packing suitable for use in connections between a first part and second part wherein the packing is placed under a compressive force. The packing comprises a generally solid cross section having a recess therein for absorbing deformation of the packing due to the compressive force. Also disclosed is a fluid-tight sealed connection, e.g., in a heat exchanger, employing the disclosed packing.

Abstract: A passage is provided in a heat exchanger water compartment to permit extension of a tube therethrough and at the same time assist in sealing the tube and passage interface. The distance between the intersection of the lower bottom edge of the water compartment bottom part with the inner edge of the passage and the intersection of the horizontal extension of the upper edge of the bottom part in the direction of the passage extension has a positive value.

Abstract: A support matrix for a catalytic reactor for scrubbing exhaust gases in an internal combustion engine, composed of layers of alternating steel panels at least some of which are coated with a catalyzer and at least one of which is corrugated so as to form flow channels for the exhaust gases. In order to increase the turbulence of the flow in the channels of the matrix, the smooth panel and/or the corrugated panel is subdivided into narrow strips which lie adjacent to one another and are encountered sequentially by the inflowing exhaust gas. Furthermore, the exhaust gases which are divided into small streams may recombine between the strips and thus encounter renewed admixture. They are then redivided in the subsequent strip resulting in an overall intensive contact of each gas stream thread with a surface of the subsequent narrow strip, thereby substantially improving the catalytic efficiency.

Abstract: A fluid friction clutch, especially for driving the cooling fan of an internal combustion engine. The rotating clutch housing has a separating wall defining a fluid reservoir chamber and a drive chamber and the separating wall has a passage which is opened and closed by a valve. The valve is actuated by an electromagnet disposed substantially coaxially with the clutch. A permanent magnet is attached to the valve assembly coaxially with the electromagnet and of opposite polarity to the magnetic field polarity which occurs when the electromagnet is energized. Upon energization, the opposing magnetic fields repel the two magnets and cause the valve to close, thereby disengaging the clutch. When the electromagnetic is deenergized, a spring reopens the valve and permits full engagement of the clutch.

Abstract: A temperature dependent electronic control switch, especially suited for an automatic temperature control in vehicles, including one or more NTC resistors as sensors in a bridge circuit, an amplifier, to amplify the signals from the sensors, a solenoid for producing a variable magnetic field from signals received by the amplifier, an iron strip, an air nozzle connected to a vacuum, a servomotor connected between the air nozzle and the vacuum, and a control flap. The iron strip, moving in response to the magnetic field from the solenoid, obstructs an opening in the air nozzle, thereby changing the pressure felt by the servomotor and thereby causing the control flap of an air-conditioner or heater to move in a predetermined manner to mix air of different temperatures.

Abstract: A quiet cooling system for internal combustion engines includes a radial impeller and a ring radiator. The ring radiator is disposed in the vicinity of the circumference of the radial impeller and is spaced at a distance from the impeller. The ring radiator can be made integral or in the form of segments. The radiator includes cooling water tubes which are to carry water and have fins fastened thereto. The cooling water tubes run parallel to the fan axis and are positioned parallel to the flow direction of cooling air leaving the radial impeller.

Abstract: An equalization tank for a cooling liquid which is subdivided by an essentially perpendicularly disposed interior partition wall into a prechamber and into a suction-discharge chamber; the vent lines which are connected with the cooling water outlet of the cooling water jacket of the engine and with the heat-exchanger thereby terminate in the prechamber whereas the auxiliary return line leading to the circulation pump for the cooling liquid terminates in the suction-discharge chamber; the partition wall is thereby also provided with a connection located near the tank bottom for cooling liquid, low in air or gas bubbles, as also with a vent connection between the prechamber and the suction-discharge chamber which is located near the tank ceiling.

Abstract: A passage is provided in a heat exchanger water compartment to permit expansion of a tube following its introduction into the bottom of the compartment. The heat exchanger is constructed so that a parameter K.sub.1 is in the range of 1.2 to 8. This parameter is equal to the length of the surface in contact between the tube and the passage multiplied by the ratio of the thickness of the bottom to the thickness of the tube wall, and the ratio of the tensile strength of the bottom material to the tensile strength of the tube material.

Abstract: A support matrix for a catalytic reactor for scrubbing exhaust gases in internal combustion engines, made of high-temperature resistant steel made up of alternating steel panels, at least one of which is corrugated, and at least one of which is provided with projections or depressions interlocking with at least one adjacent steel panel.

Abstract: An equalization tank for a cooling liquid which is subdivided by an essentially perpendicularly disposed interior partition wall into a prechamber and into a suction-discharge chamber; the vent lines which are connected with the cooling water outlet of the cooling water jacket of the engine and with the heat-exchanger thereby terminate in the prechamber whereas the auxiliary return line leading to the circulation pump for the cooling liquid terminates in the suction-discharge chamber; the partition wall is thereby also provided with a connection located near the tank bottom for cooling liquid, low in air or gas bubbles, as also with a vent connection between the prechamber and the suction-discharge chamber which is located near the tank ceiling.

Abstract: A device for the temperature regulation of water which is used in motor vehicle heating and air conditioning systems. This device contains a primary and a secondary circuit which is linked by a cruciform connector in a hydraulically switchable manner. The primary circuit includes a cooling circuit heat exchanger and a cooling water pump, with the secondary circuit containing a heater heat exchanger and a water pump driven by an electric motor.

Abstract: In a fan with a fluid friction clutch wherein the housing of the clutch is connected with the fan or has fan blades attached thereto and wherein the surface of the clutch housing facing the air intake opening of the fan is provided with cooling ribs to carry off slippage heat, the improvement comprises flow direction means for reducing the effects of the secondary air flow around the clutch housing. The flow directing means comprise either the cooling ribs on the surface of the clutch housing facing the air intake opening of the fan which ribs are curved at the outer edges thereof in a direction reverse to that of the rotation of the fan; cooling ribs of construction angled in reverse direction to that of the direction of rotation of the fan; annular cooling ribs; or cooling ribs of conventional radial arrangement covered by a flow directing intake housing.

Abstract: A water valve comprises a housing in which a spring biased slider moves between a sealing wall and a sliding wall normal to the liquid flow direction, the spring contacting the sliding wall of the housing.